3. H/W Circuit Description
- 18 -
3.3.1. Power Amplifier
The RF3166 [U500] is a quad-band EGSM/ GSM850/ DCS/ PCS power amplifier module that
incorporat es an indirect closed loop method of power control. The indirect closed loop is fully self-
contained and it do es not require loop optimization. It can be driven directly from the DAC output in
the baseband circuit. On-board power control provides over 37 dB of control range with an analog
voltage input(Vramp). Efficien cy is 60% at GSM and 55% at DCS/PCS.
3.3.2. 26MHz Clock
The 26 MHz clock consists of a TCXO(Temperature Compensated Crystal Oscillator) which oscillates
at a frequency of 26 MHz. It is used within the Si4210 RF Main Chip, BB Analog chip-set(IOTA), Digita
l chip-set(Calypso-).
Figure 5. VC-TCXO Circuit
Figure 4. Functional Block Diagram
R514
15K
C520
1uF
C518
1000p
2
OUT
3
4
VCC
1
VCONT
X500
26MHz
GND
C519
RF2.85V
1000p
TCXO_OUT
AFC
Z3X-BOX.COM
Содержание MG220
Страница 1: ...Date May 2006 Issue 1 0 Service Manual MG220 Service Manual Model MG220 Z 3 X B O X C O M ...
Страница 3: ... 2 Z 3 X B O X C O M ...
Страница 5: ...Z 3 X B O X C O M ...
Страница 32: ...3 H W Circuit Description 31 Figure 14 Power Supply Scheme Z 3 X B O X C O M ...
Страница 46: ...4 TROUBLE SHOOTING 45 4 TROUBLE SHOOTING 4 1 Main Components Placement Z 3 X B O X C O M ...
Страница 91: ...5 DOWNLOAD 90 5 2 Download Procedure 5 2 1 Computer Program file MultiGSM EXE Click Z 3 X B O X C O M ...
Страница 93: ...5 DOWNLOAD 92 5 2 3 Configuration Setting C GSMULTI Model MG220 dll Z 3 X B O X C O M ...
Страница 94: ...5 DOWNLOAD 93 5 2 4 Press Start Button Z 3 X B O X C O M ...
Страница 95: ...5 DOWNLOAD 94 5 2 5 After Start Button Which Stand by condition Z 3 X B O X C O M ...
Страница 96: ...5 DOWNLOAD 95 5 2 6 SW downloading Condition MG220 Z 3 X B O X C O M ...
Страница 97: ...5 DOWNLOAD 96 5 2 7 SW downloading END Condition Z 3 X B O X C O M ...
Страница 99: ...6 SERVICE AND CALIBRATION 98 4 Click on CALIBRATION START button Z 3 X B O X C O M ...
Страница 108: ... 107 8 pcb layout Z 3 X B O X C O M ...
Страница 109: ... 108 8 pcb layout Z 3 X B O X C O M ...
Страница 113: ... 112 Z 3 X B O X C O M ...
Страница 129: ...Note Z 3 X B O X C O M ...
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